| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py |
| ; RUN: opt < %s -instcombine -S | FileCheck %s |
| |
| declare void @use(i32) |
| declare i32 @llvm.abs.i32(i32, i1) |
| declare <4 x i32> @llvm.abs.v4i32(<4 x i32>, i1) |
| |
| define i32 @test_sdiv_canonicalize_op0(i32 %x, i32 %y) { |
| ; CHECK-LABEL: @test_sdiv_canonicalize_op0( |
| ; CHECK-NEXT: [[SDIV1:%.*]] = sdiv i32 [[X:%.*]], [[Y:%.*]] |
| ; CHECK-NEXT: [[SDIV:%.*]] = sub nsw i32 0, [[SDIV1]] |
| ; CHECK-NEXT: ret i32 [[SDIV]] |
| ; |
| %neg = sub nsw i32 0, %x |
| %sdiv = sdiv i32 %neg, %y |
| ret i32 %sdiv |
| } |
| |
| define i32 @test_sdiv_canonicalize_op0_exact(i32 %x, i32 %y) { |
| ; CHECK-LABEL: @test_sdiv_canonicalize_op0_exact( |
| ; CHECK-NEXT: [[SDIV1:%.*]] = sdiv exact i32 [[X:%.*]], [[Y:%.*]] |
| ; CHECK-NEXT: [[SDIV:%.*]] = sub nsw i32 0, [[SDIV1]] |
| ; CHECK-NEXT: ret i32 [[SDIV]] |
| ; |
| %neg = sub nsw i32 0, %x |
| %sdiv = sdiv exact i32 %neg, %y |
| ret i32 %sdiv |
| } |
| |
| ; (X/-Y) is not equal to -(X/Y), don't canonicalize. |
| define i32 @test_sdiv_canonicalize_op1(i32 %x, i32 %z) { |
| ; CHECK-LABEL: @test_sdiv_canonicalize_op1( |
| ; CHECK-NEXT: [[Y:%.*]] = mul i32 [[Z:%.*]], 3 |
| ; CHECK-NEXT: [[NEG:%.*]] = sub nsw i32 0, [[X:%.*]] |
| ; CHECK-NEXT: [[SDIV:%.*]] = sdiv i32 [[Y]], [[NEG]] |
| ; CHECK-NEXT: ret i32 [[SDIV]] |
| ; |
| %y = mul i32 %z, 3 |
| %neg = sub nsw i32 0, %x |
| %sdiv = sdiv i32 %y, %neg |
| ret i32 %sdiv |
| } |
| |
| define i32 @test_sdiv_canonicalize_nonsw(i32 %x, i32 %y) { |
| ; CHECK-LABEL: @test_sdiv_canonicalize_nonsw( |
| ; CHECK-NEXT: [[NEG:%.*]] = sub i32 0, [[X:%.*]] |
| ; CHECK-NEXT: [[SDIV:%.*]] = sdiv i32 [[NEG]], [[Y:%.*]] |
| ; CHECK-NEXT: ret i32 [[SDIV]] |
| ; |
| %neg = sub i32 0, %x |
| %sdiv = sdiv i32 %neg, %y |
| ret i32 %sdiv |
| } |
| |
| define <2 x i32> @test_sdiv_canonicalize_vec(<2 x i32> %x, <2 x i32> %y) { |
| ; CHECK-LABEL: @test_sdiv_canonicalize_vec( |
| ; CHECK-NEXT: [[SDIV1:%.*]] = sdiv <2 x i32> [[X:%.*]], [[Y:%.*]] |
| ; CHECK-NEXT: [[SDIV:%.*]] = sub nsw <2 x i32> zeroinitializer, [[SDIV1]] |
| ; CHECK-NEXT: ret <2 x i32> [[SDIV]] |
| ; |
| %neg = sub nsw <2 x i32> <i32 0, i32 0>, %x |
| %sdiv = sdiv <2 x i32> %neg, %y |
| ret <2 x i32> %sdiv |
| } |
| |
| define i32 @test_sdiv_canonicalize_multiple_uses(i32 %x, i32 %y) { |
| ; CHECK-LABEL: @test_sdiv_canonicalize_multiple_uses( |
| ; CHECK-NEXT: [[NEG:%.*]] = sub nsw i32 0, [[X:%.*]] |
| ; CHECK-NEXT: [[SDIV:%.*]] = sdiv i32 [[NEG]], [[Y:%.*]] |
| ; CHECK-NEXT: [[SDIV2:%.*]] = sdiv i32 [[SDIV]], [[NEG]] |
| ; CHECK-NEXT: ret i32 [[SDIV2]] |
| ; |
| %neg = sub nsw i32 0, %x |
| %sdiv = sdiv i32 %neg, %y |
| %sdiv2 = sdiv i32 %sdiv, %neg |
| ret i32 %sdiv2 |
| } |
| |
| ; There is combination: -(X/CE) -> (X/-CE). |
| ; If combines (X/-CE) to -(X/CE), make sure don't combine them endless. |
| |
| @X = global i32 5 |
| |
| define i64 @test_sdiv_canonicalize_constexpr(i64 %L1) { |
| ; currently opt folds (sub nsw i64 0, constexpr) -> (sub i64, 0, constexpr). |
| ; sdiv canonicalize requires a nsw sub. |
| ; CHECK-LABEL: @test_sdiv_canonicalize_constexpr( |
| ; CHECK-NEXT: [[B4:%.*]] = sdiv i64 [[L1:%.*]], sub (i64 0, i64 ptrtoint (i32* @X to i64)) |
| ; CHECK-NEXT: ret i64 [[B4]] |
| ; |
| %v1 = ptrtoint i32* @X to i64 |
| %B8 = sub nsw i64 0, %v1 |
| %B4 = sdiv i64 %L1, %B8 |
| ret i64 %B4 |
| } |
| |
| define i32 @sdiv_abs_nsw(i32 %x) { |
| ; CHECK-LABEL: @sdiv_abs_nsw( |
| ; CHECK-NEXT: [[DOTINV:%.*]] = icmp sgt i32 [[X:%.*]], -1 |
| ; CHECK-NEXT: [[R:%.*]] = select i1 [[DOTINV]], i32 1, i32 -1 |
| ; CHECK-NEXT: ret i32 [[R]] |
| ; |
| %a = call i32 @llvm.abs.i32(i32 %x, i1 true) |
| %r = sdiv i32 %a, %x |
| ret i32 %r |
| } |
| |
| define <4 x i32> @sdiv_abs_nsw_vec(<4 x i32> %x) { |
| ; CHECK-LABEL: @sdiv_abs_nsw_vec( |
| ; CHECK-NEXT: [[DOTINV:%.*]] = icmp sgt <4 x i32> [[X:%.*]], <i32 -1, i32 -1, i32 -1, i32 -1> |
| ; CHECK-NEXT: [[R:%.*]] = select <4 x i1> [[DOTINV]], <4 x i32> <i32 1, i32 1, i32 1, i32 1>, <4 x i32> <i32 -1, i32 -1, i32 -1, i32 -1> |
| ; CHECK-NEXT: ret <4 x i32> [[R]] |
| ; |
| %a = call <4 x i32> @llvm.abs.v4i32(<4 x i32> %x, i1 true) |
| %r = sdiv <4 x i32> %x, %a |
| ret <4 x i32> %r |
| } |
| |
| ; Negative test - requires poison int min (nsw) |
| |
| define i32 @sdiv_abs(i32 %x) { |
| ; CHECK-LABEL: @sdiv_abs( |
| ; CHECK-NEXT: [[A:%.*]] = call i32 @llvm.abs.i32(i32 [[X:%.*]], i1 false) |
| ; CHECK-NEXT: [[R:%.*]] = sdiv i32 [[A]], [[X]] |
| ; CHECK-NEXT: ret i32 [[R]] |
| ; |
| %a = call i32 @llvm.abs.i32(i32 %x, i1 false) |
| %r = sdiv i32 %a, %x |
| ret i32 %r |
| } |
| |
| ; Negative test |
| |
| define i32 @sdiv_abs_extra_use(i32 %x) { |
| ; CHECK-LABEL: @sdiv_abs_extra_use( |
| ; CHECK-NEXT: [[A:%.*]] = call i32 @llvm.abs.i32(i32 [[X:%.*]], i1 true) |
| ; CHECK-NEXT: call void @use(i32 [[A]]) |
| ; CHECK-NEXT: [[R:%.*]] = sdiv i32 [[A]], [[X]] |
| ; CHECK-NEXT: ret i32 [[R]] |
| ; |
| %a = call i32 @llvm.abs.i32(i32 %x, i1 true) |
| call void @use(i32 %a) |
| %r = sdiv i32 %a, %x |
| ret i32 %r |
| } |